Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/45 of 21/40?"
2145 × 2140 is 49200.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45×21/40 21/45×42/40 21/90×21/40 21/45×21/80 63/45×21/40 21/45×63/40
© everydaycalculation.com